[Archive!] Pure mathematics, physics, chemistry, etc.: brain-training problems not related to trade in any way - page 58
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Candid писал(а) >> Это называется массоперенос и транспортировать тепло таким незатейливым образом можно только в одну сторону, от тёплого к холодному. Чтобы транспортировать его в другую сторону, придётся произвести над этой массой некоторую дополнительную работу. Впрочем, вопрос о кпд обратной транспортировки пожалуй стоит обдумать ещё раз.
Nikolai, imagine yourself in bed with your mistress for a moment.
You spend 50 J to snuggle up against her body and find that you're noticeably hotter than she is. You just don't do anything, betraying 10 J by heat exchange every second. After 5 minutes you get bored with it and are horrified to notice that you have transferred 3kJ by working on 50J.
Do you think the efficiency is 6000%?
It's the same with the fridge. If you put a kilo of steamed meat in the freezer, the fridge for 3 hours will give out times more heat on the radiator behind than it takes from the outlet. There is no paradox. There is simply a transfer of heat from the meat to the outside. It is clear that the efficiency is more than 100% but not for a long time and there is no violation of thermodynamic principles. Many heat pumps including usual conditioners work on this principle. The last in winter time, for each kilowatt from a socket give out one and a half indoors (they cool the street even more).
What are the other conditions
What did the pilot have for breakfast and what is his mother-in-law's name?
The wording is quite self-sufficient and needs nothing more.
I don't understand what exactly the man doesn't understand, but I try to understand it so I can explain it to him. A person has different perceptions and this is absolutely normal. This is how many inventions and discoveries are made.
Это называется массоперенос и транспортировать тепло таким незатейливым образом можно только в одну сторону, от тёплого к холодному. Чтобы транспортировать его в другую сторону, придётся произвести над этой массой некоторую дополнительную работу. Впрочем, вопрос о кпд обратной транспортировки пожалуй стоит обдумать ещё раз.
No, there's nothing wrong there.
When compressed, freon condenses and gives off heat which the environment must "take in".
If environment (air) has high temperature (different for different freons different ) let it be 60 Celsius, process will stop
On the opposite side, the evaporator will cool down by an appropriate amount.
The process can be reversed
Equal amount of heat and "cold" just always reverses
Кстати, на счёт КПД. Как вы думаете вечный двигатель основанный на таком принципе (принцип кондиционера) возможен?
No, it is not possible. A perpetual motion machine is supposed to get energy from "nowhere", but here we get energy from a known source, the environment. We might as well get it from firewood. The same "perpetual motion machine" - there is plenty of wood.
Mischek, let's be clear. Freon condenses for 2 reasons:
1. Compression of the gas;
2. removal of heat from the condenser;
Кстати, на счёт КПД. Как вы думаете вечный двигатель основанный на таком принципе (принцип кондиционера) возможен?
No, of course not.
Because there's essentially no efficiency beyond 100 proces.
Step on the accelerator of the car = 1W
Outputs in the tens of kW
Perpetual motion machine )
Mischek, давайте уточним. Фреон конденсируется по 2-м причинам:
1. Сжатие газа;
2. Отвод тепла от конденсатора;
YesNo, it can't. A perpetual motion machine is supposed to get energy from "nowhere", but here we get energy from you know where - from the environment.
I agree. But, increasing the "efficiency" of electricity use is possible, and very promising.